Brake disc for a motorcycle



FIG. 1 is a perspective view showing the front, top and left side of abrake disc for a motorcycle which forms my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a left side elevational view thereof.

CLAIM The ornamental design for a brake disc for a motorcycle, as shownand described.